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Wire Size Tables
For Low Voltage

To Find Wire Size Required
For Less Than 5% Power Loss

Read down the left-hand edge to the number showing solar amps or watts your wire will carry. Follow that line across to the right to find your wire length in feet from solar to batteries. At the top of the column above your wire length is the minimum wire size (gauge) to use. Smaller gauge equals larger wire.

Buried DC cables must be copper, wet aluminum with DC corrodes quickly.

If your total solar power is over 25 amps, it is best to divide the solar into two smaller groups and run separate pairs of cables to a 30 amp breaker for each group.

Copper Wire Size and Length Table, 5% loss for 12 VOLT Wiring
		12ga	10ga	8ga	6ga	4ga	2ga	1/0	2/0	3/0
AMPS	WATTS	Distance in feet to run wire below, Wire size above
4	48	43	68	113	178	288	450	725	900	-
6	72	30	43	75	119	188	300	481	600	760
8	96	21	36	56	88	144	225	363	450	570
10	120	17	28	45	71	113	180	290	360	457
15	180	11	17	30	47	75	120	193	240	304
20	240	8	13	22	36	56	90	145	180	229
25	300	-	11	17	28	45	72	115	145	183
30	360	-	8	15	23	37	60	96	120	152
40	480	-	-	11	17	28	45	72	90	114
50	600	-	-	-	13	22	36	57	72	91

Copper Wire Size and Length Table, 5% loss for 24 VOLT Wiring
		12ga	10ga	8ga	6ga	4ga	2ga	1/0	2/0	3/0
AMPS	WATTS	Distance in feet to run wire below, Wire size above
4	96	87	137	226	356	576	900	-	-	-
6	144	60	87	150	238	376	600	962	-	-
8	192	42	72	112	177	288	450	726	900	-
10	240	35	57	90	142	226	360	580	720	914
15	360	22	35	60	95	150	240	386	480	608
20	480	17	27	45	72	112	180	290	360	458
25	600	-	22	35	57	90	145	230	290	366
30	720	-	17	30	47	75	120	192	240	304
40	960	-	-	23	35	57	90	145	180	228
50	1200	-	-	-	27	45	72	115	145	182

Copper Wire Size and Length Table, 5% loss for 48 VOLT Wiring
		12ga	10ga	8ga	6ga	4ga	2ga	1/0	2/0	3/0
AMPS	WATTS	Distance in feet to run wire below, Wire size above
4	192	174	274	452	712	1152	1800	-	-	-
6	288	120	174	300	476	752	1200	1924	-	-
8	384	84	144	224	354	576	900	1452	1800	-
10	480	70	114	180	284	452	720	1160	1440	1828
15	720	44	70	120	190	300	480	772	960	1216
20	960	34	54	90	144	224	360	580	720	916
25	1200	28	44	70	114	180	290	460	580	732
30	1440	24	34	60	94	150	240	384	480	608
40	1920	18	26	46	70	114	180	290	360	456
50	2400	-	22	28	54	90	144	230	290	364

Source: Backwoods Solar Electric Systems

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Wire Size TablesFor Low Voltage

To Find Wire Size RequiredFor Less Than 5% Power Loss

Wire Size Tables
For Low Voltage

To Find Wire Size Required
For Less Than 5% Power Loss